Great Blue Lobelia
Lobelia siphilitica /Bluebell Family
When Europeans brought syphilis to this country and spread it to the Native Americans, this plant was used as a futile attempt to cure the disease, thus the species name. The genus names of many plants come from famous botanists. Lobelia was named for Matthias de l'Obel, an early Flemish botanist. This blue flower is related to the bright red Cardinal Flower. I found this plant blooming at the University of Tennessee Arboretum in Oak Ridge in early September.
Where seen: Great Smoky Mountains NP, Frozen Head SP, Warrior's Path SP, University of Tennessee Arboretum